How to fix Next.js Vercel deployment module not found error

Question

My next.js app works on my machine and was working when deployed on Vercel but now it fails when building on Vercel with the following error:

I've tried deleting node_modules and running npm install a few times but with no joy.

Any help would be hugely appreciated. Thank you!

Running "npm run build" 20:43:24.926
[email protected] build /vercel/5ccaedc9 20:43:24.926
next build 20:43:24.967
internal/modules/cjs/loader.js:983 20:43:24.967
throw err; 20:43:24.967
^ 20:43:24.967
Error: Cannot find module '../build/output/log' 20:43:24.967
Require stack: 20:43:24.967
- /vercel/5ccaedc9/node_modules/.bin/next 20:43:24.967
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:980:15) 20:43:24.967
at Function.Module._load (internal/modules/cjs/loader.js:862:27) 20:43:24.967
at Module.require (internal/modules/cjs/loader.js:1042:19) 20:43:24.967
at require (internal/modules/cjs/helpers.js:77:18) 20:43:24.967
at Object. (/vercel/5ccaedc9/node_modules/.bin/next:2:46) 20:43:24.967
at Module._compile (internal/modules/cjs/loader.js:1156:30) 20:43:24.967
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10) 20:43:24.967
at Module.load (internal/modules/cjs/loader.js:1000:32) 20:43:24.967
at Function.Module._load (internal/modules/cjs/loader.js:899:14) 20:43:24.967
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12) { 20:43:24.967
code: 'MODULE_NOT_FOUND', 20:43:24.967
requireStack: [ '/vercel/5ccaedc9/node_modules/.bin/next' ] 20:43:24.967
} 20:43:24.969
npm ERR! code ELIFECYCLE 20:43:24.969
npm ERR! errno 1 20:43:24.970
npm ERR! [email protected] build: next build 20:43:24.970
npm ERR! Exit status 1 20:43:24.970
npm ERR! 20:43:24.970
npm ERR! Failed at the [email protected] build script. 20:43:24.970
npm ERR! This is probably not a problem with npm. There is likely additional logging output above. 20:43:24.974
npm ERR! A complete log of this run can be found in: 20:43:24.974
npm ERR! /vercel/.npm/_logs/2020-06-17T19_43_24_971Z-debug.log 20:43:24.979
Error: Command "npm run build" exited with 1 20:43:25.342
[dmesg] follows: 20:43:25.342
[ 962.449223] ecs-bridge: port 1(veth2a021300) entered disabled state 20:43:25.342
[ 962.453655] device veth2a021300 entered promiscuous mode 20:43:25.342
[ 962.457686] ecs-bridge: port 1(veth2a021300) entered blocking state 20:43:25.342
[ 962.462004] ecs-bridge: port 1(veth2a021300) entered forwarding state 20:43:26.242
Done with "package.json"

Here's my Package.json

{
  "name": "tdwcks",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "next",
    "build": "next build",
    "start": "next start"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "cjs": "0.0.11",
    "core-util-is": "^1.0.2",
    "framer-motion": "^1.11.0",
    "gray-matter": "^4.0.2",
    "next": "^9.4.4",
    "raw-loader": "^4.0.1",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-ga": "^3.0.0",
    "react-markdown": "^4.3.1",
    "react-player": "^2.2.0",
    "react-scripts": "^3.4.1"
  },
  "devDependencies": {
    "postcss-preset-env": "^6.7.0",
    "tailwindcss": "^1.4.6"
  }
}

Answer 1

This error typically happens if you're accidentally committing node_modules to your project's Git Repostiory.

Could you try to do the following?

1. Ensure all changes have been committed and you have a clean directory.
2. Run rm -rf node_modules (or delete the folder on Windows).
3. Run git add -A then git commit -m "Remove all module files".
4. Add node_modules to your .gitignore file (and save).
5. Run git add -A then git commit -m "Update ignored files".
6. Verify your directory is completely clean via git status.
7. Then, run git push. This deployment should work on Vercel.
8. Finally, re-run npm i or yarn depending on your package manager to get your local copy working.